In each blank, try to type in the
word that is missing. If you've
typed in the correct word, the
blank will turn green.
If your not sure what answer should be entered, press the space bar and the next missing letter will be displayed. When you are all done, you should look back over all your answers and review the ones in red. These ones in red are the ones which you needed help on. Question: how does affect things?Answer: light is the only thing you see, all visible objects either reflect or emit light, most of what we see is light Question: what are sources of ?Answer: sun, lamp, , glowing gases Question: what is and opaque?Answer: some materials let light pass through-transparent (glass, air, water)
most things don't let pass at all-opaque (wood, metal) Question: what is ?Answer: some things let light pass through in diffused (thin paper, frosted glass) Question: what do scientists now about light?Answer: it has a dual nature, part particle and part Question: what are some early of light?Answer: light has been studied for thousands of years, greek philosophers thought it was particles that entered the eye and created vision others-streamers or emitted from eye made contact with objects Question: what did think?Answer: up until the 1600s thought light was particles that in straight lines Question: what did huygens ?Answer: light was and beams could pass through each other like waves do but people still believed newton Question: what did t do?Answer: showed could be spread out like waves (diffraction) and wave theory was accepted, 19th century Question: what did do?Answer: photo electric effect, consists of particles (mass less bundles of electromagnetic energy packaged in bundles called photons) move as Question: what did do?Answer: discovered speed of light to be 300,000 km/s, spinning mirror, 1st american-nobel prize Question: what did do?Answer: tried to measure speed of with lanterns Question: what did do?Answer: astronomer who moons of jupiter to learn about speed of light Question: what is the of light?Answer: constant "c" Question: what are some speeds and for light to travel different places?Answer: around earth 7.5 times in one second, 8 minutes for light from the sun to reach earth, 4 years for from the nearest star (AlphaCentauri), the distance light can travel in one year at 300,000km/s is called a lightyear Question: what is the spectrum?Answer: of radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma rays Question: what is ?Answer: that is given off by an accelerating electric charge (e-) Question: how does this travel?Answer: a wave that is partly magnetic and partly -electromagnetic wave, light is only one kind of electromagnetic wave, range-electromagnetic spectrum Question: helpful -electromagnetic spectrumAnswer: left side longer wavelength-lower energy, right side-higher , more energy Question: what is the lowest of light we can see? highest?Answer: red, Question: what speed do electromagnetic travel at?Answer: they all travel at the same speed-the speed of light, but they are different in their frequencies and Question: what is ?Answer: electromagnetic waves of frequencies lower than the red of light, heat lamps Question: what is ?Answer: electromagnetic waves of frequencies higher than those of , sunburns |
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